Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.5016/geociencias.v39i1.14661 http://hdl.handle.net/11449/207033 |
Resumo: | Basic and ultrabasic ortho-derived rocks are composed of amphibolites, metabasites and metaultrabasites of meso to neoproterozoic age, are located in the southwest of São Paulo State, in Ribeira Belt southern portion and north of Apiaí Terrain. They are inserted in Supergroup Açungui metavolcanicsedimentary rocks, specifically in Água Clara Formation and Itaiacoca Group The main mineral paragenesis consists of ferrotschermakite- ferrohornblende- magnesiohornblende ± oligoclase andesine, representing the progressive regional metamorphism M1 climax, from 611 °C to 621 °C in temperature and 6.5 kbar to 7.3 kbar (± 0, 6) (Mid amphibolite facies); and a mineral paragenesis of actinolite tremolite ± albite, from M3 regional retrometamorphism (low to mid greenschist facies). Compositional geochemical data classify the rocks as gabbro, basanite and picrite, low potassium sub alkaline to alkaline, Fe-tholeitic to Mg-tholeitic, with a slight tendency to komatiitic basalts. Geotectonic data, corroborated by the behavior of trace elements and REEs, indicate three main signatures for amphibolitic groups: Basic tholeitic and komatiitic rocks associated with mid-ocean ridge (MORB), with possible crust interaction in subduction phase; ultrabasic alkaline ocean island rocks (OIA); and island arc tholeiitic basalts. Therefore, magmatism is correlated to the initial stage of opening of the basin or to the beginning of closure, to the initial phase of tholeitic ocean floor nature, associated with ocean island alkaline basalts. |
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Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo stateGeologia E Geoquímica Das Rochas Metabásicas Do Supergrupo Açungui A Norte Da Zona De Cisalhamento Quarenta Oitava, Sul Do Estado De São PauloAçungui SupergroupGeochemistryGeologyMetabasicBasic and ultrabasic ortho-derived rocks are composed of amphibolites, metabasites and metaultrabasites of meso to neoproterozoic age, are located in the southwest of São Paulo State, in Ribeira Belt southern portion and north of Apiaí Terrain. They are inserted in Supergroup Açungui metavolcanicsedimentary rocks, specifically in Água Clara Formation and Itaiacoca Group The main mineral paragenesis consists of ferrotschermakite- ferrohornblende- magnesiohornblende ± oligoclase andesine, representing the progressive regional metamorphism M1 climax, from 611 °C to 621 °C in temperature and 6.5 kbar to 7.3 kbar (± 0, 6) (Mid amphibolite facies); and a mineral paragenesis of actinolite tremolite ± albite, from M3 regional retrometamorphism (low to mid greenschist facies). Compositional geochemical data classify the rocks as gabbro, basanite and picrite, low potassium sub alkaline to alkaline, Fe-tholeitic to Mg-tholeitic, with a slight tendency to komatiitic basalts. Geotectonic data, corroborated by the behavior of trace elements and REEs, indicate three main signatures for amphibolitic groups: Basic tholeitic and komatiitic rocks associated with mid-ocean ridge (MORB), with possible crust interaction in subduction phase; ultrabasic alkaline ocean island rocks (OIA); and island arc tholeiitic basalts. Therefore, magmatism is correlated to the initial stage of opening of the basin or to the beginning of closure, to the initial phase of tholeitic ocean floor nature, associated with ocean island alkaline basalts.Programa de Pós-Graduação em Geociências IGCE UNESP-Univ Estadual PaulistaDepartamento de Petrologia e Metalogenia IGCE- UNESP Universidade Estadual Paulista, Av. 24A, 1515-Bela VistaPrograma de Pós-Graduação em Geociências IGCE UNESP-Univ Estadual PaulistaDepartamento de Petrologia e Metalogenia IGCE- UNESP Universidade Estadual Paulista, Av. 24A, 1515-Bela VistaUniversidade Estadual Paulista (Unesp)Vieira, Otávio Augusto Ruiz Paccola [UNESP]Godoy, Antonio Misson [UNESP]Luvizotto, George Luiz [UNESP]Zenero, Jonas Menezes [UNESP]2021-06-25T10:47:54Z2021-06-25T10:47:54Z2020-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article21-46http://dx.doi.org/10.5016/geociencias.v39i1.14661Geociencias, v. 39, n. 1, p. 21-46, 2020.1980-900X0101-9082http://hdl.handle.net/11449/20703310.5016/geociencias.v39i1.146612-s2.0-85098447221Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporGeocienciasinfo:eu-repo/semantics/openAccess2021-10-23T16:01:08Zoai:repositorio.unesp.br:11449/207033Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:48:59.553561Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state Geologia E Geoquímica Das Rochas Metabásicas Do Supergrupo Açungui A Norte Da Zona De Cisalhamento Quarenta Oitava, Sul Do Estado De São Paulo |
title |
Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state |
spellingShingle |
Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state Vieira, Otávio Augusto Ruiz Paccola [UNESP] Açungui Supergroup Geochemistry Geology Metabasic |
title_short |
Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state |
title_full |
Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state |
title_fullStr |
Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state |
title_full_unstemmed |
Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state |
title_sort |
Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state |
author |
Vieira, Otávio Augusto Ruiz Paccola [UNESP] |
author_facet |
Vieira, Otávio Augusto Ruiz Paccola [UNESP] Godoy, Antonio Misson [UNESP] Luvizotto, George Luiz [UNESP] Zenero, Jonas Menezes [UNESP] |
author_role |
author |
author2 |
Godoy, Antonio Misson [UNESP] Luvizotto, George Luiz [UNESP] Zenero, Jonas Menezes [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Vieira, Otávio Augusto Ruiz Paccola [UNESP] Godoy, Antonio Misson [UNESP] Luvizotto, George Luiz [UNESP] Zenero, Jonas Menezes [UNESP] |
dc.subject.por.fl_str_mv |
Açungui Supergroup Geochemistry Geology Metabasic |
topic |
Açungui Supergroup Geochemistry Geology Metabasic |
description |
Basic and ultrabasic ortho-derived rocks are composed of amphibolites, metabasites and metaultrabasites of meso to neoproterozoic age, are located in the southwest of São Paulo State, in Ribeira Belt southern portion and north of Apiaí Terrain. They are inserted in Supergroup Açungui metavolcanicsedimentary rocks, specifically in Água Clara Formation and Itaiacoca Group The main mineral paragenesis consists of ferrotschermakite- ferrohornblende- magnesiohornblende ± oligoclase andesine, representing the progressive regional metamorphism M1 climax, from 611 °C to 621 °C in temperature and 6.5 kbar to 7.3 kbar (± 0, 6) (Mid amphibolite facies); and a mineral paragenesis of actinolite tremolite ± albite, from M3 regional retrometamorphism (low to mid greenschist facies). Compositional geochemical data classify the rocks as gabbro, basanite and picrite, low potassium sub alkaline to alkaline, Fe-tholeitic to Mg-tholeitic, with a slight tendency to komatiitic basalts. Geotectonic data, corroborated by the behavior of trace elements and REEs, indicate three main signatures for amphibolitic groups: Basic tholeitic and komatiitic rocks associated with mid-ocean ridge (MORB), with possible crust interaction in subduction phase; ultrabasic alkaline ocean island rocks (OIA); and island arc tholeiitic basalts. Therefore, magmatism is correlated to the initial stage of opening of the basin or to the beginning of closure, to the initial phase of tholeitic ocean floor nature, associated with ocean island alkaline basalts. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-01-01 2021-06-25T10:47:54Z 2021-06-25T10:47:54Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.5016/geociencias.v39i1.14661 Geociencias, v. 39, n. 1, p. 21-46, 2020. 1980-900X 0101-9082 http://hdl.handle.net/11449/207033 10.5016/geociencias.v39i1.14661 2-s2.0-85098447221 |
url |
http://dx.doi.org/10.5016/geociencias.v39i1.14661 http://hdl.handle.net/11449/207033 |
identifier_str_mv |
Geociencias, v. 39, n. 1, p. 21-46, 2020. 1980-900X 0101-9082 10.5016/geociencias.v39i1.14661 2-s2.0-85098447221 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Geociencias |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
21-46 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1808128706294579200 |